/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/HeadMountedDisplayFunctionLibrary.h
Returns whether or not the HMD hardware is connected and ready to use. It may or may not actually be in use.
(Boolean) status whether the HMD hardware is connected and ready to use. It may or may not actually be in use.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintPure, Category="Input|HeadMountedDisplay", Meta=(KeyWords="HMD")) static bool IsHeadMountedDisplayConnected()